Android App Runtastic for Free

I've been using MyFitnessPal for the past few months and although I've been religiously following the recommended daily intake of calories, I haven't been losing that much weight. A friend of mine suggested trying out a new app called Runtastic for monitoring your sit-ups routine and I was so relieved that it will integrate with MyFitnessPal. It is a paid app but when I tried downloading it, I found out that it is being offered for free if you use the promo code APPOFTHEDAY. It still saved me $2 that I can use towards my FarmVille 2 addiction. I've been using it for the past week and I must say that the features of it with counting sit-ups using an accelerometer and having all your records available to calculate statistics, this is the simplest work-out app I've tried in the market.